Abstract: A V-engine is provided with a scotch yoke and connecting rods attaching plural pistons to the yoke such that the power stroke of both pistons is substantially simultaneous and the return strokes are substantially silmultaneous. Piston dwell is introduced by virtue of the lateral and angular displacement of the pistons in their respective angularly disposed cylinders and, in addition, dwell is introduced by virtue of the scotch yoke configuration wherein the slot retaining a sliding block connecting the yoke to the throw of a crankshaft may be of various configurations, rectilinear, curvilinear and offset arcuate in configuration.

Abstract: An assembly for locking together in sliding relationship a yoke with a sliding block with one of the walls of a crankcase and having a channel apparatus isolated from the crankcase volume throughout rotation of the crankshaft for transmitting lubricant from an aperture in one of the walls of the crankcase via the yoke to lubricate the sliding block and crankthrow.

Abstract: An internal combustion engine has means for stabilizing the position of a yoke and piston during the reciprocating movement. A pressure source transmits a force to one side of yoke to maintain the yoke in constant contact with a bearing surface on the wall of the crankcase, at the same time, the pressure source causes lubrication to be continually transmitted to a sliding block within the yoke at all positions of the crankshaft to lubricate the bearing between the crank throw and sliding block and the bearings between the sliding block and yoke to minimize wear during extended use. The yoke and piston are further stabilized in their reciprocating motion by a peg and ring configuration, one of which is mounted to the crankcase and the other mounted to the yoke. Twist of the yoke and piston about the cylinder axis is prevented by channels in the crankcase wall within which the yoke edges slide.